The invention discloses a method for constructing an UDDI (universal description, discovery and integration) extended model in a cloud computing environment. When a cloud service provider registers, basic information, quality information and resource information of service are registered into an extended UDDI model, and a register agent receives the information and processes the information; and when a cloud service user queries, querying is carried out in the extended UDDI model by virtue of the basic information, the quality information and the resource information of the service, and a query agent receives the information and processes the information. The method disclosed by the invention considers the characteristic of the cloud computing environment, the quality information and the resource information of the cloud service are extended into the existing UDDI model, and when the cloud service provider registers the service, the quality information and the resource information of the cloud service also can be registered; and the cloud service user also can screen the service by utilizing the quality information and the resource information of the service as constraint conditions by virtue of the extended UDDI model.